It auto uploads all your photos to the cloud and you can delete them locally and still have them. The biggest feature is the AI search, you can type anything and it will find your pictures without you doing any work categorizing them. It can do objects or backgrounds or colors and it can even do faces so you can search by people's name. That and there's share links to albums and multiplayer albums.

It keeps the originals locally when it uploads forever unless you delete them. There's a one click "free up space on this device" button to delete the local files. It's actually somewhat annoying to export in bulk, you pretty much have to use takeout.